The commit is a legit stable fix and part of the Ubuntu 16.04 kernel since version 4.4.0-18 (your dmesg shows you a re running 4.4.0-34). So unfortunately not helping in your case. I extracted the relevant syslog data below. >From that info, the two disks are connected to a Marvell controller in RAID mode. The change you found was ignoring the HPCP bit. But a drive would still marked as removable if the port had a ESP bit set and the controller had a SXS capability set. I don't think the port bits show up in the log but the controller does have SXS set. So there might be a chance that in your BIOS, there is an option related to the Marvell controller that says "ESP" somewhere. And if you disable that, the drives no longer are removable.
But generally I think dmraid (and fwiw the desktop environment mounting everything removable) uses incorrect assumptions about what removable means. All USB disks are removable but not all removable disks are USB... 06:00.0 RAID bus controller [0104]: Marvell Technology Group Ltd. 88SE9172 SATA III 6Gb/s RAID Controller [1b4b:9192] (rev 12) Subsystem: Gigabyte Technology Co., Ltd Device [1458:b000] [ 0.693411] ahci 0000:06:00.0: AHCI 0001.0000 32 slots 2 ports 6 Gbps 0x3 impl RAID mode [ 0.693413] ahci 0000:06:00.0: flags: 64bit ncq sntf led only pmp fbs pio slum part sxs [ 0.693609] scsi host8: ahci [ 0.693679] scsi host9: ahci [ 0.693707] ata9: SATA max UDMA/133 abar m512@0xfb410000 port 0xfb410100 irq 43 [ 0.693710] ata10: SATA max UDMA/133 abar m512@0xfb410000 port 0xfb410180 irq 43 [ 1.184050] ata10: SATA link up 6.0 Gbps (SStatus 133 SControl 300) [ 1.184069] ata9: SATA link up 6.0 Gbps (SStatus 133 SControl 300) [ 1.184636] ata10.00: ATA-9: ST2000DM001-1CH164, CC27, max UDMA/133 [ 1.184638] ata10.00: 3907029168 sectors, multi 0: LBA48 NCQ (depth 31/32), AA [ 1.184654] ata9.00: ATA-9: ST2000DM001-1CH164, CC27, max UDMA/133 [ 1.184655] ata9.00: 3907029168 sectors, multi 0: LBA48 NCQ (depth 31/32), AA [ 1.185166] ata10.00: configured for UDMA/133 [ 1.185182] ata9.00: configured for UDMA/133 [ 1.185306] scsi 8:0:0:0: Direct-Access ATA ST2000DM001-1CH1 CC27 PQ: 0 ANSI: 5 [ 1.185443] sd 8:0:0:0: [sdb] 3907029168 512-byte logical blocks: (2.00 TB/1.82 TiB) [ 1.185445] sd 8:0:0:0: [sdb] 4096-byte physical blocks [ 1.185451] sd 8:0:0:0: Attached scsi generic sg2 type 0 [ 1.185525] sd 8:0:0:0: [sdb] Write Protect is off [ 1.185527] sd 8:0:0:0: [sdb] Mode Sense: 00 3a 00 00 [ 1.185553] sd 8:0:0:0: [sdb] Write cache: enabled, read cache: enabled, doesn't support DPO or FUA [ 1.185577] scsi 9:0:0:0: Direct-Access ATA ST2000DM001-1CH1 CC27 PQ: 0 ANSI: 5 [ 1.185711] sd 9:0:0:0: [sdc] 3907029168 512-byte logical blocks: (2.00 TB/1.82 TiB) [ 1.185713] sd 9:0:0:0: [sdc] 4096-byte physical blocks [ 1.185725] sd 9:0:0:0: Attached scsi generic sg3 type 0 [ 1.185782] sd 9:0:0:0: [sdc] Write Protect is off [ 1.185784] sd 9:0:0:0: [sdc] Mode Sense: 00 3a 00 00 [ 1.185807] sd 9:0:0:0: [sdc] Write cache: enabled, read cache: enabled, doesn't support DPO or FUA [ 1.189274] sd 8:0:0:0: [sdb] Attached SCSI removable disk -- You received this bug notification because you are a member of Kernel Packages, which is subscribed to linux in Ubuntu. https://bugs.launchpad.net/bugs/1611277 Title: Kernel Shipped With Ubuntu 16.04.1 Cannot Recognize fakeRaid Status in dmraid package in Ubuntu: Confirmed Status in linux package in Ubuntu: Invalid Status in dmraid source package in Xenial: New Status in linux source package in Xenial: Invalid Bug description: Kernel shipped with Ubuntu 16.04.1 cannot recognize fakeRaid created from Ubuntu 14.04. I've tried three ways but none of them work. 1. Update 14.04.4 to 16.04.1 2. Fresh install 16.04.1 3. Update kernel to linux-images-4.4.0-34-generic only The result is that the mapper was seperated into /dev/sdb and /dev/sdc and cannot be rebuild with dmraid (said no raid disk) or mdadm (said no superblock). Something interesting is that when I reinstall Ubuntu 14.04.2 with my old CD, during the installation Ubuntu is able to recognize /dev/mapper/.... But when I do a fresh install in Ubuntu 16.04 with the CD, I get /dev/sdb and /dev/sdc The motherboard I'm using is Gigabyte X79-UP4 The fakeRaid with Marvell chipset on my motherboard shows the following information with fdisk in Ubuntu 16.04.1. /dev/sda is where the system is installed. It is a normal hard drive. /dev/sdb and /dev/sdc are using raid 1. Disk /dev/sda: 1000.2 GB, 1000204886016 bytes 255 heads, 63 sectors/track, 121601 cylinders, total 1953525168 sectors Units = sectors of 1 * 512 = 512 bytes Sector size (logical/physical): 512 bytes / 4096 bytes I/O size (minimum/optimal): 4096 bytes / 4096 bytes Disk identifier: 0x000b7321 Device Boot Start End Blocks Id System /dev/sda1 * 2048 499711 248832 83 Linux /dev/sda2 501758 1953523711 976510977 5 Extended Partition 2 does not start on physical sector boundary. /dev/sda5 501760 1953523711 976510976 8e Linux LVM Disk /dev/sdb: 2000.4 GB, 2000398934016 bytes 255 heads, 63 sectors/track, 243201 cylinders, total 3907029168 sectors Units = sectors of 1 * 512 = 512 bytes Sector size (logical/physical): 512 bytes / 4096 bytes I/O size (minimum/optimal): 4096 bytes / 4096 bytes Disk identifier: 0x00000000 Disk /dev/sdb doesn't contain a valid partition table Disk /dev/sdc: 2000.4 GB, 2000398934016 bytes 255 heads, 63 sectors/track, 243201 cylinders, total 3907029168 sectors Units = sectors of 1 * 512 = 512 bytes Sector size (logical/physical): 512 bytes / 4096 bytes I/O size (minimum/optimal): 4096 bytes / 4096 bytes Disk identifier: 0x00000000 Disk /dev/sdc doesn't contain a valid partition table Disk /dev/mapper/ubuntu--vg-root: 982.8 GB, 982805118976 bytes 255 heads, 63 sectors/track, 119485 cylinders, total 1919541248 sectors Units = sectors of 1 * 512 = 512 bytes Sector size (logical/physical): 512 bytes / 4096 bytes I/O size (minimum/optimal): 4096 bytes / 4096 bytes Disk identifier: 0x00000000 Disk /dev/mapper/ubuntu--vg-root doesn't contain a valid partition table Disk /dev/mapper/ubuntu--vg-swap_1: 17.1 GB, 17091788800 bytes 255 heads, 63 sectors/track, 2077 cylinders, total 33382400 sectors Units = sectors of 1 * 512 = 512 bytes Sector size (logical/physical): 512 bytes / 4096 bytes I/O size (minimum/optimal): 4096 bytes / 4096 bytes Disk identifier: 0x00000000 Disk /dev/mapper/ubuntu--vg-swap_1 doesn't contain a valid partition table The fakeRaid with Marvell chipset on my motherboard shows the following information with fdisk in Ubuntu 14.04.4. Disk /dev/mapper/ddf1_00000000000000004b1b92914b1b92914b0400004b040001: 2000.3 GB, 2000315047936 bytes 255 heads, 63 sectors/track, 243191 cylinders, total 3906865328 sectors Units = sectors of 1 * 512 = 512 bytes Sector size (logical/physical): 512 bytes / 4096 bytes I/O size (minimum/optimal): 4096 bytes / 4096 bytes Disk identifier: 0x3b9fee89 Device Boot Start End Blocks Id System /dev/mapper/ddf1_00000000000000004b1b92914b1b92914b0400004b040001p1 2048 3906865151 1953431552 83 Linux Disk /dev/mapper/ddf1_00000000000000004b1b92914b1b92914b0400004b040001p1: 2000.3 GB, 2000313909248 bytes 255 heads, 63 sectors/track, 243190 cylinders, total 3906863104 sectors Units = sectors of 1 * 512 = 512 bytes Sector size (logical/physical): 512 bytes / 4096 bytes I/O size (minimum/optimal): 4096 bytes / 4096 bytes Disk identifier: 0x00000000 Disk /dev/mapper/ddf1_00000000000000004b1b92914b1b92914b0400004b040001p1 doesn't contain a valid partition table --- ApportVersion: 2.14.1-0ubuntu3.21 Architecture: amd64 AudioDevicesInUse: USER PID ACCESS COMMAND /dev/snd/controlC1: bblab 6762 F.... pulseaudio /dev/snd/controlC0: bblab 6762 F.... pulseaudio DistroRelease: Ubuntu 14.04 HibernationDevice: RESUME=UUID=433bcdda-b73d-47e7-abb8-8fab93db4123 InstallationDate: Installed on 2016-07-26 (14 days ago) InstallationMedia: Ubuntu 14.04.2 LTS "Trusty Tahr" - Release amd64 (20150218.1) MachineType: Gigabyte Technology Co., Ltd. To be filled by O.E.M. Package: linux (not installed) ProcFB: 0 nouveaufb ProcKernelCmdLine: BOOT_IMAGE=/vmlinuz-4.4.0-34-generic root=/dev/mapper/ubuntu--vg-root ro quiet splash vt.handoff=7 ProcVersionSignature: Ubuntu 4.4.0-34.53~14.04.1-generic 4.4.15 RelatedPackageVersions: linux-restricted-modules-4.4.0-34-generic N/A linux-backports-modules-4.4.0-34-generic N/A linux-firmware 1.127.22 RfKill: Tags: trusty Uname: Linux 4.4.0-34-generic x86_64 UpgradeStatus: No upgrade log present (probably fresh install) UserGroups: adm cdrom dip lpadmin plugdev sambashare sudo _MarkForUpload: True dmi.bios.date: 12/16/2013 dmi.bios.vendor: American Megatrends Inc. dmi.bios.version: F5 dmi.board.asset.tag: To be filled by O.E.M. dmi.board.name: X79-UP4 dmi.board.vendor: Gigabyte Technology Co., Ltd. dmi.board.version: To be filled by O.E.M. dmi.chassis.asset.tag: To Be Filled By O.E.M. dmi.chassis.type: 3 dmi.chassis.vendor: Gigabyte Technology Co., Ltd. dmi.chassis.version: To Be Filled By O.E.M. dmi.modalias: dmi:bvnAmericanMegatrendsInc.:bvrF5:bd12/16/2013:svnGigabyteTechnologyCo.,Ltd.:pnTobefilledbyO.E.M.:pvrTobefilledbyO.E.M.:rvnGigabyteTechnologyCo.,Ltd.:rnX79-UP4:rvrTobefilledbyO.E.M.:cvnGigabyteTechnologyCo.,Ltd.:ct3:cvrToBeFilledByO.E.M.: dmi.product.name: To be filled by O.E.M. dmi.product.version: To be filled by O.E.M. dmi.sys.vendor: Gigabyte Technology Co., Ltd. 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